Piaware: 234 aircraft, 1700/sec messages, map doesn't show jumbo flying over my house

With Auto you mean AGC via setting -10? That leads to a gain a little above 50, which is even higher than the highest manual gain you set manually.

The automatic gain works with a constant signal like TV, but not with the many different and short adsb messages.

To find the „best“ gain value, you can use a python script. Just search this forum for posts by @abcd567, or @obj, who maintains dump1090fa and knows a thing or two about it.

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